If you're not getting the text verification for MFA to your mobile phone or "short codes", you will need to contact your phone provider. It is possible that your provider might be blocking the number. Some lines may block certain short codes and the user will need to work this out with their cell phone provider. 

T-Mobile user need to contact T-Mobile using the number below:

Below are a list of providers and their contact information:

Below is a list of Cellular Providers that use T - Mobile Network.

T-Mobile carriers list

• Boost Mobile

• Boom! Mobile

• Consumer Cellular

• FreeUP Mobile

• Metro by T-Mobile

• Mint Mobile

• Red Pocket

• Straight Talk

• Tello

• TextNow

• Tracfone

• Ultra Mobile

• Unreal Mobile

• US Mobile

• Wing

• Good2Go Mobile

• Hello Mobile

• GoSmart Mobile

• Reach Mobile

• Lycamobile

• Walmart Family Mobile

• Sprint